EasyChemistryHigh School (9–10)GeneralAtoms and Molecules › Molecules, Ions and FormulaeConceptualBoard Exam

Give the atomicity of each, and say whether it is monatomic, diatomic, triatomic or has more atoms.

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Argon, $\text{Ar}$
Chlorine, $\text{Cl}_2$
Carbon dioxide, $\text{CO}_2$
White phosphorus, $\text{P}_4$
Ethane, $\text{C}_2\text{H}_6$

Need a reminder? The key ideaShow

A molecule is a group of atoms joined together. Its atomicity is the number of atoms in it. A small number after a symbol counts atoms in one molecule; a number in front counts molecules; a number after a bracket multiplies everything inside.

The worked solution

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Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

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Give the atomicity of each, and say whether it is monatomic, diatomic, triatomic or has more atoms.

The worked solution

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